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S156 is a high strength VAR steel with a tensile strength of between 1320-1520 MPa. Material is supplied in the normalised and softened / annealed condition and develops a hard wear resistance case after surface treatment.

Specific Gravity

7.8 g/cm3

Typical Applications

Related Specifications

Helicopter and aircraft gears

Motorsport gears 


W.Nr 1.6722

W.Nr 1.6723


Chemical Composition (Wt %)

  C Si Mn P S Cr Mo Ni Fe
Min 0.14 0.10 0.25 1.0 0.20 3.8 Bal
Max 0.18 0.35 0.55 0.015 0.012 1.4 0.30 4.3

Typical Mechanical Properties after heat treatment

0.2% Proof Stress Tensile Strength Elongation Reduction of area Hardness
MPA MPA % % ft lbf
Min Min Max  Min  Min  Min
1030 1320 1520 11 40  30

Hardness in Normalised and Softened Condition

 277 HB Max
* Every effort has been made to ensure that our technical specifications are accurate. However, technical specifications included within Dynamic Metals Ltd should be used as a guideline only and are subject to change without notice.
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